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DEBT - Aggregate maturities (Details) - USD ($)
$ in Thousands
Sep. 29, 2018
Dec. 30, 2017
Aggregate maturities of bank debt    
2018 $ 219  
2019 875  
2020 875  
2021 875  
2022 and thereafter 44,613  
Total 47,457  
Unamortized debt issuance costs $ 2,497 $ 1,127